001package biweekly.io.xml;
002
003import java.util.Arrays;
004import java.util.Iterator;
005
006import javax.xml.namespace.NamespaceContext;
007import javax.xml.xpath.XPath;
008
009/*
010 Copyright (c) 2013-2015, Michael Angstadt
011 All rights reserved.
012
013 Redistribution and use in source and binary forms, with or without
014 modification, are permitted provided that the following conditions are met: 
015
016 1. Redistributions of source code must retain the above copyright notice, this
017 list of conditions and the following disclaimer. 
018 2. Redistributions in binary form must reproduce the above copyright notice,
019 this list of conditions and the following disclaimer in the documentation
020 and/or other materials provided with the distribution. 
021
022 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
023 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
024 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
025 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
026 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
027 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
028 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
029 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
030 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
031 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
032 */
033
034/**
035 * Used for xCal xpath expressions.
036 * @see XPath#setNamespaceContext(NamespaceContext)
037 * @author Michael Angstadt
038 */
039public class XCalNamespaceContext implements NamespaceContext {
040        /**
041         * The XML namespace for xCal documents.
042         */
043        public static final String XCAL_NS = "urn:ietf:params:xml:ns:icalendar-2.0";
044
045        private final String prefix;
046
047        /**
048         * Creates a new namespace context.
049         * @param prefix the prefix to use in xpath expressions
050         */
051        public XCalNamespaceContext(String prefix) {
052                this.prefix = prefix;
053        }
054
055        /**
056         * Gets the prefix to use in xpath expressions.
057         * @return the xpath prefix
058         */
059        public String getPrefix() {
060                return prefix;
061        }
062
063        //@Override
064        public String getNamespaceURI(String prefix) {
065                if (this.prefix.equals(prefix)) {
066                        return XCAL_NS;
067                }
068                return null;
069        }
070
071        //@Override
072        public String getPrefix(String ns) {
073                if (XCAL_NS.equals(ns)) {
074                        return prefix;
075                }
076                return null;
077        }
078
079        //@Override
080        public Iterator<String> getPrefixes(String ns) {
081                if (XCAL_NS.equals(ns)) {
082                        return Arrays.asList(prefix).iterator();
083                }
084                return null;
085        }
086}